For most "normal" launches, I don't usually have to reprogram any of my trackers, modules, etc. However, at "big" launches, I definitely have encountered the need to reprogram telemetry modules.
Instead of an expensive switch, I would be happy if the PGM short was handled by a 2-pin header like most of the other Eggtimer devices. That is a lot easier than trying to solder/desolder the pads.